Recent content by Dao Tuat

Okay, that makes sense. Thanks a lot! How does the first answer look? I feel like I did it wrong. Is it safe to assume constant pressure, or should I be trying to solve this some other way? Thanks again for your help.

I have two questions. First: a coffe-cup clorimeter, 125 mL of a 2.75 M solution of silver nitrate at 25.00 degrees C is comined with 350 mL of a 4.00 M strontium chloride solution, aslo at 25.00 C. The temperature of the final solution is 32.15 degrees C. If the density of the final...

Thanks for everyones help. I'm still a bit confused though. Any tips would be very much appreciated.

Homework Statement Solve the following differntial equation Homework Equations (x+y-4)dy - (2x-y+1)dy = 0 EDIT: Oops, it should be (x+y-4)dy - (2x-y+1)dx = 0 The Attempt at a Solution I integrated both sides and ended up with: [y(2x +y-8)]/2 = X^2 + x(1-y) + c Did I solve this...

Can someone give me some help, or at least tell me if I'm on the right track with this? Heres what I was given: 4y'' - 4y' - 3y=0 y(0)=1 y'(0)=5 Heres what I did: (sorry about the c1 and c2, I don't know how to make them show up as subsript) 4(r^2) - 4r - 3 = 0 r = 3/2 r=-1/2...

Do these answeres and approach look right?

Yes, it looked like the first one, which is the same as y=7*sqrt[-1/(7[ln(t)+c])], correct? What I did was end up with -[(t^3)/(t^4)]dt=[(y^-6)/(y^2)]dy after seperating I then integrated and got -ln(t)+c=-1/(7y^7), and then solved for y. For the other equation, dy/dx - y/x =...

Can anyone help me out with the second equation? I'm completely lost.

Ok, so I separated them and integrated and ended up with: y=[7^(6/7)]/(7(ln(t)-c)) Does this look right? Thanks, Dao Tuat

Could somone help me out and tell me what method to use to solve: (t^3)(y^2)dt + (t&4)(y^-6)dy = 0 Also, the equation dy/dx - y/x = (x^2)sin2x is homogeneous, right? Thanks, Dao Tuat

Thanks for your help. I would also like to say sorry if I seemed a bit rude. The only reason I didn't put out any work was because its so hard for my to type it all out. Anyways, here's what I have: For the first problem, I got it to dy/dx = y/x + (sqrt((x^3)-(y^2)))/x and then set v = y/x. I...

Show work? Perhaps you misunderstood, I am asking how to do these problems. I would like someone who has some free time and wouldn't mind helping me out, to work them out for me - or at least get me started. It's been a few years since I've had a class like this so I'm a bit rusty. As I said...

I was taking a class, but got deployed before finishing and now I am trying to do it on my own so that I can take it online and finish it fairly fast once I get back home. I just received my book in the mail from back home not too long ago and I've been doing a little whenever I have a chance...

So then neither a or b are solutions, right?

Could someone please help me with this problem: Consider the differential equation d^2y/dx^2 + dy/dx - 6y = 0 with the initial conditions y(0)= 6 and y'(0)=2. Determine whether the following functions are solutions: a. y=4e^(2x) + 2e^(-3x) b. y=2e^(2x) + 4e^(-3x) If someone could...